[GHC] #605: Optimisation: strict enumerations

[GHC]

#605: Optimisation: strict enumerations
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        Reporter:  simonmar          |                Owner:
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  ⊥
       Component:  Compiler          |              Version:  None
      Resolution:  None              |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:  N/A
      Blocked By:                    |             Blocking:
 Related Tickets:  #6135             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 FWIW we can currently store strict enumerations as `Int#`s with
 Phab:D2424.

 Phab:D2436 allows returning `Int#` when returned enumeration is used
 strictly.

 Another patch is needed for extending demand analysis and passing `Int#`
 for strict enumerations. I actually have most of the code ready, but it
 needs rebasing it on current HEAD. IIRC some parts of the demand analysis
 were missing, but I can't remember exactly which parts.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/605#comment:21>
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